ReadObject() and writeObjectO never called

Question

I have classes to transfer images through RMI. ImageDescriptor interface provides basic method to override:
public interface ImageDescriptor extends Serializable
  public void paint(java.awt.Graphics g, int x, int y, int width, int height);
}BinaryImageDescriptor is used for transferring binary data. It worked but byte[]->Image transform took some time (done once in the paint method, which caused a delay while painting for the first time) so I decided to move this routine to a method and call it when object is deserialized:
import java.awt.*;
import javax.imageio.*;
import java.nio.*;
import java.nio.channels.*;
import java.io.*;
import java.awt.image.*;
public class BinaryImageDescriptor
    implements ImageDescriptor, Serializable {
  private byte[] imageData = null;
  private transient Image image = null;
  private transient boolean updated = false;
  private transient ImageObserver observer = null;
  public BinaryImageDescriptor(byte[] imageData) {
    this.imageData = imageData;
    updated = false;
  public BinaryImageDescriptor(String fileLocation) {
    try {
      File file = new File(fileLocation);
      FileInputStream fis = new FileInputStream(file);
      FileChannel fc = fis.getChannel();
      int filelength = (int) file.length();
      MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0,
                                    filelength);
      this.imageData = new byte[filelength];
      mbb.get(this.imageData);
      System.out.println("Binary Image Success: " + fileLocation);
    catch (IOException ex) {
      System.out.println("Binary Image error: " + fileLocation);
      this.imageData = null;
  public void updateBinaryImage() {
    System.out.println("Update Binary");
    try {
      image = javax.imageio.ImageIO.read(new ByteArrayInputStream(imageData));
    catch (Exception ex) {
      image = null;
      ex.printStackTrace();
  public void paint(Graphics g, int x, int y, int width, int height) {
    // Previously I used to read Image here by calling updateBinaryImage() once
    if (image != null) {
      g.drawImage(image, x, y, width, height, null);
  public void setObserver(ImageObserver observer) {
    this.observer = observer;
  private void writeObject(java.io.ObjectOutputStream oos) throws IOException {
    //This method is never called
    System.out.println("Inside write Object");
    oos.defaultWriteObject();
  private void readObject(java.io.ObjectInputStream ois) throws
      ClassNotFoundException, IOException {
    //This method is never called too
    System.out.println("Inside readObject");
    ois.defaultReadObject();
    updateBinaryImage();
  public byte[] getImageData() {
    return imageData;
}But the problem is, the readObject() and writeObject() (on the server side) are never called. So the Image remains null and nothing is painted.
Could you help?
ps: I do not obsfucate the code. Some package definitions are removed (due to propriarity) but the code compiles fine.

Answer 1

silly mistake of me, fixed. error outside the code.
---CLOSED---